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Aluminum-based alloy low-temperature washing soldering paste and preparation method thereof

An aluminum-based alloy, low-temperature technology, applied in welding equipment, metal processing equipment, welding media, etc., can solve the problems that cannot meet the requirements of brazing and sealing of refrigeration system components, achieve good metallurgical bonding structure, avoid sedimentation and stratification, The effect of easy filling of weld seams

Active Publication Date: 2021-10-22
BEIJING INST OF NONFERROUS METALS & RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]The brazing temperature of most hard aluminum alloys should not exceed 530°C, and the brazing temperature of copper-aluminum dissimilar metals must be lower than 540°C. The brazing temperature of silicon-based alloy brazing filler metals needs to exceed 585 °C, the brazing temperature of aluminum-copper-silicon-based and aluminum-silicon-zinc alloy brazing filler metals needs to exceed 550 °C, and the brazing temperature required by other aluminum and multi-element alloys exceeds 530 °C, which cannot meet the requirements. Requirements for soldering and sealing of refrigeration system components

Method used

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  • Aluminum-based alloy low-temperature washing soldering paste and preparation method thereof
  • Aluminum-based alloy low-temperature washing soldering paste and preparation method thereof
  • Aluminum-based alloy low-temperature washing soldering paste and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1 Ultrasonic centrifugal atomization equipment

[0052] The ultrasonic centrifugal atomization equipment used in the present invention is as figure 1 As shown, the ultrasonic centrifugal atomization equipment includes a preparation bin 1 , a tundish 2 , a draft tube 4 , an umbrella-like ultrasonicator 5 , a centrifugal disc 6 , an air-filled tube 7 and a collection bin 8 .

[0053] A tundish 2 , a draft tube 4 , an umbrella-shaped ultrasonic device 5 and a centrifugal disc 6 are sequentially arranged in the preparation chamber 1 from top to bottom.

[0054] There is a heating device on the tundish 2 . The top of the tundish is connected to the nitrogen pipe 3 and has an alloy solution casting port. The bottom of the tundish 2 is connected with a diversion tube 4, and the diameter of the diversion tube is 2-5 mm.

[0055] Below the guide tube 4 is an umbrella-shaped ultrasonic device 5 , the upper surface of the ultrasonic device is in the shape of an umbrella...

Embodiment 2

[0058] Example 2 Preparation of Aluminum-Based Alloy Low-Temperature Washing Solder Paste (1)

[0059] (1) material preparation

[0060] Weigh 692.8 grams of Al, 170 grams of Ag, 76 grams of Cu, 60 grams of Si, 1 gram of Ni and 0.2 grams of Ce.

[0061] (2) Preparation of master alloy

[0062] Using a non-vacuum intermediate frequency induction furnace, add Al ingots into the graphite crucible, heat up and after the aluminum ingots are melted, add 10g of covering agent and slag remover (the composition is AlF 3 : 45wt%, KF: balance), fully stirred, the temperature of the furnace was raised to 800°C, and Ag, Cu, Si, Ce were added in batches. After all the metals were melted, they were refined for 20 minutes, cast into ingots, and respectively obtained Al-30Ag, Al-50Cu, Al-30Si, Al-10Ce master alloys.

[0063] Using a vacuum intermediate frequency induction furnace, add pure Cu and pure nickel into the graphite crucible, and the furnace is vacuumed to 10 -1 Pa, the furnace t...

Embodiment 3

[0070] Example 3 Preparation of Aluminum-Based Alloy Low-Temperature Washing Solder Paste (2)

[0071] (1) material preparation

[0072] Weigh 639 grams of Al, 190 grams of Ag, 60 grams of Cu, 100 grams of Si, 10 grams of Ni and 1 gram of Ce.

[0073] (2) Preparation of master alloy

[0074] Al-30Ag, Al-50Cu, Al-30Si, Al-10Ce, Cu-30Ni master alloys were respectively prepared by the same method as in Example 2.

[0075] (3) Preparation of aluminum-based alloy powder by ultrasonic centrifugal atomization

[0076] The ultrasonic centrifugal atomization equipment described in Example 1 is used for powder preparation, and the remaining high alumina and Al-30Ag, Al-50Cu, Al-30Si, Al-10Ce, Cu-30Ni master alloys are respectively mixed according to the design component ratio , calculated and weighed respectively, and put into an alumina crucible; melt the solder alloy in an intermediate frequency induction furnace, the heating power is 30KW, and the melting temperature is 800°C; the...

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Abstract

The invention discloses aluminum-based alloy low-temperature washing soldering paste. The aluminum-based alloy low-temperature washing soldering paste is composed of 65wt%-80wt% of aluminum-based alloy powder, 12wt%-20wt% of low-temperature non-corrosive aluminum soldering flux, 0-5wt% of a dispersing agent and 5%-20% of a carrier. The aluminum-based alloy powder is composed of 15wt%-19wt% of Ag, 6wt%-10wt% of Cu, 4wt%-10wt% of Si, 0.1wt%-1wt% of Ni, 0.01wt%-0.1wt%of Ce and the balance Al. The low-temperature non-corrosive aluminum soldering flux is composed of AlF3, KF, LiF, K3AlF6, CsF and RbF. The melting temperature of the soldering paste is low, the soldering paste is suitable for flame brazing, non-vacuum furnace welding and high-frequency heating brazing, the brazing temperature range is 515-520 DEG C, the welded seam interface is compact after welding, the air tightness is good, the tensile strength is good, and residues after welding can be removed through deionized water cleaning. The requirements of duralumin non-vacuum low-temperature brazing, aluminum-copper dissimilar metal pipeline connection, liquid cooling device packaging brazing and the like can be met.

Description

technical field [0001] The invention belongs to the field of aluminum alloy brazing and sealing, and in particular relates to an aluminum-based alloy low-temperature water-washing solder paste and a preparation method. Background technique [0002] Aluminum alloy itself has low density, excellent physical properties such as high electrical conductivity, high thermal conductivity, corrosion resistance, etc., and also has excellent plasticity and chemical stability. It is the most widely used alloy material for national defense, military and civilian industries. , especially in the refrigeration industry, it has become an indispensable main material as a liquid cooling pipe, heat dissipation shell or box. However, whether it is carrying liquid cooling, air cooling or interface heat conduction, it is necessary to form a closed leak-free pipeline or a dense interface between aluminum alloy materials to achieve heat dissipation and cooling effects. Furthermore, many copper-based...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/28B23K35/363
CPCB23K35/286B23K35/362B23K35/3605B23K35/0244
Inventor 黄晓猛宋文杰张国清陈怡兰窦程亮李彬齐岳峰王冉
Owner BEIJING INST OF NONFERROUS METALS & RARE EARTH
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